/*!
 * Crypto-JS v1.1.0
 * http://code.google.com/p/crypto-js/
 * Copyright (c) 2009, Jeff Mott. All rights reserved.
 * http://code.google.com/p/crypto-js/wiki/License
 */
(function() {

  // Shortcut
  var util = Crypto.util;

  // Constants
  var K = [0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,
    0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
    0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,
    0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
    0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,
    0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,
    0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,
    0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,
    0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,
    0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,
    0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,
    0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,
    0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,
    0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,
    0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,
    0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2
  ];

  // Public API
  var SHA256 = Crypto.SHA256 = function(message, options) {
    var digestbytes = util.wordsToBytes(SHA256._sha256(message));
    return options && options.asBytes ? digestbytes :
      options && options.asString ? util.bytesToString(digestbytes) :
      util.bytesToHex(digestbytes);
  };

  // The core
  SHA256._sha256 = function(message) {

    var m = util.stringToWords(message),
      l = message.length * 8,
      H = [0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
        0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19
      ],
      w = [],
      a, b, c, d, e, f, g, h, i, j,
      t1, t2;

    // Padding
    m[l >> 5] |= 0x80 << (24 - l % 32);
    m[((l + 64 >> 9) << 4) + 15] = l;

    for (var i = 0; i < m.length; i += 16) {

      a = H[0];
      b = H[1];
      c = H[2];
      d = H[3];
      e = H[4];
      f = H[5];
      g = H[6];
      h = H[7];

      for (var j = 0; j < 64; j++) {

        if (j < 16) w[j] = m[j + i];
        else {

          var gamma0x = w[j - 15],
            gamma1x = w[j - 2],
            gamma0 = ((gamma0x << 25) | (gamma0x >>> 7)) ^
            ((gamma0x << 14) | (gamma0x >>> 18)) ^
            (gamma0x >>> 3),
            gamma1 = ((gamma1x << 15) | (gamma1x >>> 17)) ^
            ((gamma1x << 13) | (gamma1x >>> 19)) ^
            (gamma1x >>> 10);

          w[j] = gamma0 + (w[j - 7] >>> 0) +
            gamma1 + (w[j - 16] >>> 0);

        }

        var ch = e & f ^ ~e & g,
          maj = a & b ^ a & c ^ b & c,
          sigma0 = ((a << 30) | (a >>> 2)) ^
          ((a << 19) | (a >>> 13)) ^
          ((a << 10) | (a >>> 22)),
          sigma1 = ((e << 26) | (e >>> 6)) ^
          ((e << 21) | (e >>> 11)) ^
          ((e << 7) | (e >>> 25));


        t1 = (h >>> 0) + sigma1 + ch + (K[j]) + (w[j] >>> 0);
        t2 = sigma0 + maj;

        h = g;
        g = f;
        f = e;
        e = d + t1;
        d = c;
        c = b;
        b = a;
        a = t1 + t2;

      }

      H[0] += a;
      H[1] += b;
      H[2] += c;
      H[3] += d;
      H[4] += e;
      H[5] += f;
      H[6] += g;
      H[7] += h;

    }

    return H;

  };

  // Package private blocksize
  SHA256._blocksize = 16;

})();
